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Solid-state storage & DBMS

Solid-state storage & DBMS. CIDR 2013 Manos Athanassoulis. Flash is replacing disks. Flash not a drop-in replacement for disks . But, random writes on flash Instability in performance Shorter device lifetime And flash capacity is expensive

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Solid-state storage & DBMS

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  1. Solid-state storage & DBMS CIDR 2013 Manos Athanassoulis

  2. Flash is replacing disks Flash not a drop-in replacement for disks But, random writes on flash • Instability in performance • Shorter device lifetime And flash capacity is expensive Is flash ready/suitable for secondary storage? Reverse: Howcan DBMS exploit flash?

  3. Disks all over the place Re-architect DBMS needed for solid-state storage Buffers • DBMS modules assumes disks • Storage • Buffer management • Indexing • Logging • Lower-level: • Block APIs • Storage software stack

  4. How to use flash in a “disk-world”? Buffers

  5. How to use flash in a “disk-world”? Buffers Updates • As a specialized write cache • Hides update overhead

  6. How to use flash in a “disk-world”? Buffers • As a specialized write cache • Hides update overhead • As secondary storage • Offers efficient random access

  7. How to use flash in a “disk-world”? SSDBuffer Buffers • As a specialized write cache • Hides update overhead • As secondary storage • Offers efficient random access • As a “regular” cache level

  8. Flash, solid-state, DBMS:The challenges are far from done …

  9. Flash Wall Capacity: Density will plateau (soon) Endurance (already)

  10. PCM, memristor and co More than flash: How to use persistent main memory?

  11. Software stack is too slow

  12. Flash Wall(s) Persistent main memory OS & FS too slow Thank you! Manos Athanassoulis

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